Even more striking were the 80% who said they would be willing to invest or donate 5% of their annual salary for a second citizenship — more than they spend on monthly rent.

Luckily, a number of countries offer Citizenship by Investment (CIP) programs where money — normally invested in real estate — can actually buy a second passport, and the elite status that comes along with owning citizenship in another country.

Other programs offer "elite residency" — an extended visa with perks — in exchange for similar investments.

Nuri Katz, President of Apex Capital Partners, an international advisory firm that specialises in CIPs, told Business Insider: "For a lot of wealthy people having a second or third passport is important for the ability to travel. For some it's also a status symbol, like buying a fancy car to show your friends."

He added that along with the travel benefits and the status that comes along with owning real estate around the world, the programs also allow people to manage their tax burdens.

"Second citizenship is becoming more than just getting a passport," he said. "There are certain advantages towards using second citizenship to create residence in countries where tax burdens would be lower than where you are at the current time."

However, Katz explained there's a difference between CIPs and residency programs.

"Citizenship is forever, and cannot be taken away unless you received it under fraudulent circumstances," he said. "You also get a passport."

Meanwhile, as laws change, a residency visa can be taken away — but it's a more affordable way to get the perks that come along with living in another country.

Whether you choose to splash out for full citizenship or you invest in residency, here are 23 countries where money can buy you a second passport — or at least a chance to live long-term abroad — ranked by cost, from cheapest to most expensive.

=17. St. Kitts and Nevis — Citizenship from $150,000 (£116,657).

Following the devastation St. Kitts and Nevis faced after last year's hurricane season, pricing for the CIP programme has been adjusted, according to Katz. Its citizens also now have access to more than 150 jurisdictions worldwide, since the country has signed travel treaties with the likes of Russia, Moldova, Nepal, India, Indonesia, Rwanda, and Taiwan within the last year.

Here are your options, according to Henley & Partners:

A non-refundable donation of $250,000 for a single applicant to the SIDF, a non-profit foundation which funds the developent of alternative industries to support the national economy, or;

A non-refundable donation to the SIDF of $300,000 for an applicant with up to three dependants, as well as an additional $25,000 per additional dependent, or;

A non-refundable contribution of $150,000 to the SGF, a fund which supports economic growth in all sectors of the economy, with an additional $25,000 for a spouse or $10,000 for each additional applicant, or;

The purchase of real estate valued at at least $200,000 which cannot be sold for a seven-year period, or;The purchase of real estate valued at at least $400,000 which cannot be sold for a five-year period.

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=17. Grenada — Citizenship from $150,000 (£115,910).

EQRoy/Shutterstock

There are two ways to get citizenship through investment in Grenada:

A $150,000 (£154,226) donation to the Grenada National Transformation Fund, or;

16. Vanuatu — Citizenship from $155,000 (£120,878).

According to the latest CBI Index, the Vanuatu Contribution Programme (VCP) is one of two active citizenship by investment schemes, alongside the Development Support Programme (DSP), but under the DSP citizens cannot vote or participate in political life.

15. Moldova — Citizenship from €146,300 ($169,292 or £130,798).

A CIP program has been confirmed for Moldova, and according to Henley & Partners, in order to qualify for citizenship, an applicant must make the following contribution:

-A minimum non-refundable contribution to the Public Investment Fund (PIF) of €100,000 for a single applicant, plus service provider and agent fees of €35,000, government fees of €5,000, due diligence fees of €6,000, and biometric passport fees of €300.

While the Cambodian senate approved a draft law on June 11, 2018 that could alter the country's economic citizenship landscape (and increase the investment thresholds,) for now, these are the options:

Invest 1.2bn Cambodian riels ($294,276 or £229,571) into the nation. Investment must be approved by either by the Cambodian Development Council or by the Royal Government, or;

Donate 1bn Cambodian riels ($245,230 or £191,309) for the restoration and rebuilding of Cambodia's economy.

Applications must also have knowledge of Khmer history and language, and must travel to Cambodia to obtain good behaviour, police, and health certificates, as well as to sign the relevant citizenship oath.

8. Bulgaria — Citizenship from 1 million BGN (£461,422 or $593,384).

A 1 million Bulgarian lev (£448,443) investment in a full-guaranteed government bond for five years.

The investment will be returned to the investor after the term without interest.

The fast-track option:

Investment of 1 million lev (£448,443) in government-guaranteed bonds, and;

Investment of an additional 1 million lev (£448,443) one year later.

At least one year of permanent residency

You must hold both investments for at least two years after the citizenship is granted.

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7. Canada — Citizenship from $800,000 (£476,020 or $612,075).

Canoeing on Emerald Lake in summer at the Yoho National Park Alberta Canada
r.classen/Shutterstock

Created by the Canadian government to attract wealthy business people to the country, the Immigrant Investors Program means you can gain permant residency if you meet the following four criteria, according to Henley & Partners:

Demonstrate proper business experience — must have previously managed or operated a qualified business for at least two out of five years preceding your application, and;

1. UK — Visa from £2 million ($2.57 million).

Luke Hexter, director of global citizenship and residence planning company Knightsbridge Capital Partners, told BI that the UK Tier 1 Investor Visa is one of its most popular.

Here's how it works:

Investment of £2 million into the UK economy (in UK government bonds, share capital or loan capital in active and trading UK-registered companies, other than those principally engaged in property investment)

Applicants must be at least 18 years of age and be from outside the European Economic Area (EEA) and Switzerland.

The visa allows you to stay for 3 years, 4 months, which can be extended a further 2 years.

Applicants can apply for indefinite leave to remain after 5 years in the UK.

Applicants can apply for British citizenship after spending 6 years in the country.